Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.
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On Thu, Apr 28, 2011 at 03:52:28PM +0200, Jan Kara wrote: > On Thu 28-04-11 12:36:30, Colin Ian King wrote: > > One more data point to add, I've been looking at an identical issue when > > copying large amounts of data. I bisected this - and the lockups occur > > with commit > > 3e7d344970673c5334cf7b5bb27c8c0942b06126 - before that I don't see the > > issue. With this commit, my file copy test locks up after ~8-10 > > iterations, before this commit I can copy > 100 times and don't see the > > lockup. > Adding Mel to CC, I guess he'll be interested. Mel, it seems this commit > of yours causes kswapd on non-preempt kernels spin for a *long* time... > I'm still thinking about the traces which do not point the finger directly at compaction per-se but it's possible that the change means kswapd is not reclaiming like it should be. To test this theory, does applying [d527caf2: mm: compaction: prevent kswapd compacting memory to reduce CPU usage] help? -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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